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Glam Journal

What is a metal brake used for?

Author

Emily Wilson

Updated on April 07, 2026

What is a metal brake used for?

A brake is a metalworking machine that allows the bending of sheet metal. A cornice brake only allows for simple bends and creases, while a box-and-pan brake also allows one to form box and pan shapes. It is also known as a bending machine or bending brake or in Britain as a sheet metal folder or just a folder.

What is an aluminum brake used for?

Sometimes called a siding brake or an aluminum brake, this tool can be used for cutting and bending flashing for windows and doors, and for cladding for exterior soffits and fascias. It also can be used for any number of small projects that require bent light-gauge sheet metal or vinyl.

How does a sheet metal brake work on a car?

Brakes are fairly simple machines. The sheet metal slips into the throat of the brake where an upper jaw clamps it firmly in place. A lower jaw pivots on a continuous hinge to bend the material to the desired angle. Shapes are created by making a series of predetermined bends in a specific sequence.

How do you bend an aluminum brake frame?

Insert your aluminum sheet into the brake beneath the removable clamp bar. Lift the clamp bar away from the rear of the brake frame and slide the sheet in perpendicularly to the direction you want to bend it. Then, place the clamp bar back down on top of the aluminum crosswise. Make sure the bar is seated firmly inside the frame.

What to do when renting a sheet metal brake?

When renting a brake, make sure a slitter is included for cutting sheets to width. Bending a drip edge is a good project to demonstrate how to use a brake. A drip edge requires several different kinds of bends, from a slight kickout to a full fold.

What’s the best way to bend a window?

Begin with the finished side up, bend 90 degrees at about 2 inches from the edge. Flip metal over, so that the finished side is down, bend 90 degrees. Hem the seam. Flip the metal finished side up, slide the short leg into the brake, and bend another 90. This returns the J-channel.

Insert your aluminum sheet into the brake beneath the removable clamp bar. Lift the clamp bar away from the rear of the brake frame and slide the sheet in perpendicularly to the direction you want to bend it. Then, place the clamp bar back down on top of the aluminum crosswise. Make sure the bar is seated firmly inside the frame.

Brakes are fairly simple machines. The sheet metal slips into the throat of the brake where an upper jaw clamps it firmly in place. A lower jaw pivots on a continuous hinge to bend the material to the desired angle. Shapes are created by making a series of predetermined bends in a specific sequence.

When renting a brake, make sure a slitter is included for cutting sheets to width. Bending a drip edge is a good project to demonstrate how to use a brake. A drip edge requires several different kinds of bends, from a slight kickout to a full fold.

What’s the best way to make a brake clamp?

Step 2: Start the hem seam with a full fold. Insert the 6-in.-wide sheet 1⁄2 in. into the brake. Lock the sheet in place by pulling the top handle forward. Then lift the bending plate as far as it can travel. Step 3: Compress the hem seam, then create the kickout. The top of the clamp’s leading edge can be used to complete full folds.